Originally Posted by Infernox222
Hello, I was actually visiting this site to fix my issue with Rockband not having any sounds on my Plasma HDTV through the Xbox 360 Pro (elite just not colored) I found that if you go to the ingame sound settings there is a box for Dolby Digital sounds. Click this and the sound should start. I sure hope this helps!
The problem is that this seems to be intrinsic to the 360, not to Rock Band. Rock Band keeps looking for the 5.1, but the 360 is saying it doesn't exist, so no sound in Rock Band. You have to switch it to stereo, or do one of the above "fixes" to get the 5.1 signal working right. Other games will go ahead and use the stereo signal instead without the need to change anything.But the bigger issue (as stated by those of us above) is that the 360 seems to have a problem recognizing 5.1 over HDMI.
As suggested above, I've also tried turning on the AVR before the 360 (and vice versa), but it still happens. The other problem is that it's an intermittent problem, so it only happens on occasion. But it happens often enough to be annoying (say, 1 out of 5 boot ups).
It's also an easy problem to miss if you're not paying attention to what your AVR is doing. Since I have my AVR set up to matrix 5.1 from a stereo signal, it took me until just a couple of days ago to notice that my AVR wasn't always getting a true 5.1 signal from the 360.
Judging from other posters' comments above, this sounds like it could be a pretty common issue, but also an under-recognized and under-reported one since it's fairly easy to miss.
Needless to say, I'm a bit annoyed. It's not a bad enough issue for me to send the box in (in case it's just a faulty console), but it's enough to make me more annoyed with MS's "workmanship" than I was before. I was one of the folks who waited until the RRoD stuff was (mostly) ironed out, thinking that they'd finally gotten the hardware kinks worked out. Guess I was wrong.
Hopefully, this is either just a faulty console with a minor defect, or it's a firmware issue that can be resolved with an update.
Any of you other folks above with this issue try contacting MS?
EDIT: So I popped over to the xbox forums. Looks like this is, indeed, a common issue. Most of the people noticing it have Elites, but I think that's just because of the relative number of folks who have both an Elite and an HDMI-capable AVR compared to those (like me) who only recently picked up one of the other HDMI skus.